Lord Valemar is a principal follower of Merificus, the principal antagonist in Aralon: Sword and Shadow HD, thus making him one of the deadliest enemies in the game. He killed Captain Renlyn Lordel, players' father, and captured Gorak, the royal guard helping players with the main quest of the game. His home, Valemar Keep, is in the Western Kingdom, very close to Redrock Bay.
As part of the main storyline, Darius sends players to rescue Gorak, who has been taken (on Merificus' orders) by Lord Valemar. The player must fight his or her way through Valemar Keep, which is filled with corrupt knights and priestesses. Players must also kill Lord Valemar as well as free Gorak who is being held in the Dungeons.
Lord Valemar has the ability to teleport around the room when players are fighting him. The best way to combat this ability is to stun Lord Valemar and to time attacks so that he doesn't have time to use his ability to teleport. I have found that whirling blades (warrior), judgment attacks (paladin), vicious strikes (rogue), fire arrows (ranger) and fist of ice (mage) blows are most effective for each of the respective classes to use against Lord Valemar. Valemar is fairly highly leveled, 32, and has some valuable loot, including a Shade Ax, which, at a minimum, helps players with the gold they will receive for it and is a formidable weapon.